We had a tough time scaring up any good grub along Quang Trung, though the restaurant at the Saigon Kimlien is bound to provide a safe if somewhat unexciting option.
The best places we found were located in the area in back of the Phuong Dong Hotel to the east of the Central City Park. Restaurant Kim Anh 2 is a great place to head in the evening for a nice, surprisingly intimate atmosphere (by Vietnamese standards), where you can pick out fresh seafood from one of the fish tanks, and try out specialities like turtle. There's also a small selection of foreign wines.
Nearby, on same street, Da Dieu offers banquet style tables made for large groups, but it's a popular place with a wide ranging menu. The speciality is da dieu, which is nothing too exotic -- just plain old ostrich meat. This makes the place easy to spot -- there's a big picture of an ostrich out front.
It's the kind of place where westerners are bound to get invited over to someone else's table and plied with imported Vodka, so be prepared to make an evening of it.
Da Dieu Restaurant: 78 Ngo Sy Lien, Vinh. T: (038) 359 2909. Hours: 07:00 to 24:00
Kim Anh 2: 33 Ngo Sy Lien, Vinh. T: (094) 889 8346. Hours: 06:00 to 24:00